<template>
    <div class="header">
        <!-- 折叠按钮 -->
        <div class="collapse-btn" @click="collapseChage">
            <i class="el-icon-menu"></i>
        </div>
        <div class="logo">后台管理</div>
        <div class="header-right">
            <div class="header-user-con">
                <!-- 全屏显示 -->
                <div class="btn-fullscreen" @click="handleFullScreen">
                    <el-tooltip effect="dark" :content="fullscreen?`取消全屏`:`全屏`" placement="bottom">
                        <i class="el-icon-rank"></i>
                    </el-tooltip>
                </div>
                <!-- 消息中心 -->
                <div class="btn-bell">
                    <el-tooltip effect="dark" :content="message?`有${message}条未读消息`:`消息中心`" placement="bottom">
                        <router-link to="/tabs">
                            <i class="el-icon-bell"></i>
                        </router-link>
                    </el-tooltip>
                    <span class="btn-bell-badge" v-if="message"></span>
                </div>
                <!-- 用户头像 -->
                <div class="user-avator"><img src="../../assets/header/123.jpg"></div>
                <!-- 用户下拉菜单 -->
                <el-dropdown class="user-name" trigger="click" @command="handleCommand">
                    <span class="el-dropdown-link">
                        {{username}} <i class="el-icon-caret-bottom"></i>
                    </span>
                    <el-dropdown-menu slot="dropdown">
                        <el-dropdown-item command="toUserSetting">个人设置</el-dropdown-item>
                        <el-dropdown-item divided  command="loginout">退出登录</el-dropdown-item>
                    </el-dropdown-menu>
                </el-dropdown>
            </div>
        </div>
    </div>
</template>
<script>
import bus from 'components/bus.js'
export default {
    data() {
        return {
            collapse: true,
            fullscreen: false,
            name: 'linxin',
            message: 2
        }
    },
    computed: {
        username() {
            let username = localStorage.getItem('ms_username');
            return username ? username : this.name;
        }
    },
    created() {
        
    },
    methods: {
        // 用户名下拉菜单选择事件
        handleCommand(command) {
          switch (command) {
              case 'loginout':
                    localStorage.removeItem('ms_username')
                    this.$router.push('/');
                  break;
              case 'toUserSetting':
                  bus.$emit('toUserSetting', command)
                  break;
            
              default:
                  break;
          }
        },
        // 侧边栏折叠
        collapseChage() {
            this.collapse = !this.collapse;
            bus.$emit('collapse', this.collapse);
        },
        // 全屏事件
        handleFullScreen(){
          let element = document.documentElement;
          if (this.fullscreen) {
            if (document.exitFullscreen) {
              document.exitFullscreen();
            } else if (document.webkitCancelFullScreen) {
              document.webkitCancelFullScreen();
            } else if (document.mozCancelFullScreen) {
              document.mozCancelFullScreen();
            } else if (document.msExitFullscreen) {
              document.msExitFullscreen();
            }
          } else {
            if (element.requestFullscreen) {
              element.requestFullscreen();
            } else if (element.webkitRequestFullScreen) {
              element.webkitRequestFullScreen();
            } else if (element.mozRequestFullScreen) {
              element.mozRequestFullScreen();
            } else if (element.msRequestFullscreen) {
              // IE11
              element.msRequestFullscreen();
            }
          }
          this.fullscreen = !this.fullscreen;
        }
    },
    mounted(){
        if(document.body.clientWidth < 1500){
            this.collapseChage();
        }
    }
}
</script>
<style>
    .header {
        position: relative;
        box-sizing: border-box;
        width: 100%;
        height: 70px;
        font-size: 22px;
        color: #fff;
        }
        .collapse-btn{
            float: left;
            padding: 0 21px;
            cursor: pointer;
            line-height: 70px;
        }
        .logo{
            float: left;
            width:250px;
            line-height: 70px;
        }
        .header-right{
            float: right;
            padding-right: 50px;
        }
        .header-user-con{
            display: flex;
            height: 70px;
            align-items: center;
        }
        .btn-fullscreen{
            transform: rotate(45deg);
            margin-right: 5px;
            font-size: 24px;
        }
        .btn-bell, .btn-fullscreen{
            position: relative;
            width: 30px;
            height: 30px;
            text-align: center;
            border-radius: 15px;
            cursor: pointer;
        }
        .btn-bell-badge{
            position: absolute;
            right: 0;
            top: -2px;
            width: 8px;
            height: 8px;
            border-radius: 4px;
            background: #f56c6c;
            color: #fff;
        }
        .btn-bell .el-icon-bell{
            color: #fff;
        }
        .user-name{
            margin-left: 10px;
        }
        .user-avator{
            margin-left: 20px;
        }
        .user-avator img{
            display: block;
            width:40px;
            height:40px;
            border-radius: 50%;
        }
        .el-dropdown-link{
            color: #fff;
            cursor: pointer;
        }
        .el-dropdown-menu__item{
            text-align: center;
        }
    
</style>